Apparatus and method for adjusting display characters of display device

Abstract

A display panel driver includes an image data generator, a brightness correction circuit performing a correction calculation on image data, a drive section driving the display panel in response to corrected image data; and a display timing generator outputting a timing control signal. The correction calculation by the brightness correction circuit is adjustable. When the display panel driver is placed into a test mode, the display timing generator is configured to output an internally-generated timing control signal and the image data generator outputs internally-generated evaluation image data. The evaluation image data are generated so that the evaluation images are switched from one to another in response to the internally-generated timing control signal.

What is claimed is: 
     
       1. A display driver comprising:
 a brightness correction circuit configured to generate corrected image data based on evaluation image data; 
 driver circuitry configured to drive a display panel with the corrected image data; and 
 an interface unit configured to write a correction parameter value in a storage element based on a correction parameter write command, wherein the correction parameter value corresponds to a relationship between the evaluation image data and the corrected image data. 
 
     
     
       2. The display driver of  claim 1 , wherein the evaluation image data comprises evaluation images. 
     
     
       3. The display driver of  claim 2 , further comprising a display timing generator configured to, in a first state: output an internal timing control signal, and
 wherein the driver circuitry is further configured to drive the display panel with the evaluation images based on the internal timing control signal. 
 
     
     
       4. The display driver of  claim 2 , wherein the evaluation images are automatically generated. 
     
     
       5. The display driver of  claim 2 , wherein generating the evaluation image data comprises switching from a first evaluation image of the evaluation images to a second evaluation image of the evaluation images. 
     
     
       6. The display driver of  claim 5 , wherein switching from the first evaluation image to the second evaluation image is based on a cycle period of frame periods. 
     
     
       7. The display driver of  claim 1 , further comprising:
 an image data generator configured to:
 in a first state, generate the evaluation image data, wherein grey level values of each pixel in each evaluation image of the evaluation image data are the same; 
 change the grey level values when switching between evaluation images; and 
 in a second state, provide image data received from an external source. 
 
 
     
     
       8. The display driver of  claim 1 , wherein the display driver is configured to:
 measure image characteristics of evaluation images displayed on the display panel; and 
 determine the correction parameter value. 
 
     
     
       9. A display driver comprising:
 an image data generator configured to, in a first state:
 generate evaluation images, wherein grey level values of each pixels in each of the evaluation images are the same; and 
 change the grey level values when switching between the evaluation images; 
 
 a brightness correction circuit configured to generate corrected image data based on the evaluation images; and 
 driver circuitry configured to drive a display panel with the corrected image data. 
 
     
     
       10. The display driver of  claim 9 , wherein switching between the evaluation images comprises switching from a first evaluation image of the evaluation images to a second evaluation image of evaluation images in response to an internal timing control signal. 
     
     
       11. The display driver of  claim 9 , wherein the driver circuitry is further configured to drive the display panel with the evaluation images. 
     
     
       12. The display driver of  claim 9 , wherein the display driver is configured to:
 measure image characteristics of the evaluation images displayed on the display panel; and 
 determine a correction parameter value. 
 
     
     
       13. The display driver of  claim 9 , further comprising:
 an interface unit configured to write a correction parameter value in a storage element based on a correction parameter write command, wherein the correction parameter value corresponds to a relationship between the evaluation images and the corrected image data. 
 
     
     
       14. A display device comprising:
 a display panel comprising a plurality of pixels; and 
 a display driver comprising:
 a brightness correction circuit configured to generate corrected image data based on evaluation image data; 
 driver circuitry configured to drive the plurality of pixels with the corrected image data; and 
 an interface unit configured to write a correction parameter value in a storage element based on a correction parameter write command, wherein the correction parameter value corresponds to a relationship between the evaluation image data and the corrected image data. 
 
 
     
     
       15. The display device of  claim 14 , wherein the evaluation image data comprises evaluation images. 
     
     
       16. The display device of  claim 15  wherein the evaluation images are automatically generated. 
     
     
       17. The display device of  claim 15 , wherein generating the evaluation image data comprises switching from a first evaluation image of the evaluation images to a second evaluation image of the evaluation images. 
     
     
       18. The display device of  claim 17 , wherein switching from the first evaluation image to the second evaluation image is based on a cycle period of frame periods. 
     
     
       19. The display device of  claim 14 , further comprising:
 an image data generator configured to:
 in a first state, generate the evaluation image data, wherein grey level values of each pixel in each evaluation image of the evaluation image data are the same; 
 change the grey level values when switching between evaluation images; and 
 in a second state, provide image data received from an external source. 
 
 
     
     
       20. The display device of  claim 14 , wherein the display driver is configured to:
 measure image characteristics of evaluation images displayed on the display panel; and 
 determine a correction parameter value.